netdev - BUG: unable to handle kernel NULL pointer dereference in sctp_cmp_addr

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Message-ID: <001a1146f1143233340560c0d18a@google.com>
Date:   Tue, 19 Dec 2017 23:49:03 -0800
From:   syzbot 
        <bot+07ea76fffac26ec31e0f0bf349d7859a91b55a85@...kaller.appspotmail.com>
To:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        nhorman@...driver.com, syzkaller-bugs@...glegroups.com,
        vyasevich@...il.com
Subject: BUG: unable to handle kernel NULL pointer dereference in sctp_cmp_addr_exact

Hello,

syzkaller hit the following crash on  
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

Unfortunately, I don't have any reproducer for this bug yet.


binder: 23647:23660 DecRefs 0 refcount change on invalid ref 4 ret -22
binder: 23647:23660 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0
binder: 23647:23660 BC_REQUEST_DEATH_NOTIFICATION invalid ref 3
binder: 23647:23660 got reply transaction with no transaction stack
binder: 23647:23660 transaction failed 29201/-71, size 24-16 line 2747
BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
IP: sctp_cmp_addr_exact+0x14/0x60 net/sctp/associola.c:911
PGD 1dde2b067 P4D 1dde2b067 PUD 1ddf17067 PMD 0
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 23653 Comm: syz-executor1 Not tainted 4.15.0-rc3-next-20171214+  
#67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:sctp_cmp_addr_exact+0x14/0x60 net/sctp/associola.c:911
RSP: 0018:ffffc90000da7b38 EFLAGS: 00010216
RAX: 0000000000010000 RBX: fffffffffffffff0 RCX: ffffffff823e3464
RDX: 0000000000000731 RSI: ffffc90003199000 RDI: 0000000000000078
RBP: ffffc90000da7b50 R08: 0000000000000001 R09: 0000000000000002
R10: ffffc90000da7b18 R11: 0000000000000002 R12: 0000000000000078
R13: ffff8801d9231488 R14: ffffc90000da7bc8 R15: ffffffff831e6c20
FS:  00007f601f498700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000078 CR3: 00000001d9071000 CR4: 00000000001426f0
DR0: 0000000020000008 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
  sctp_hash_cmp+0x2b/0xb0 net/sctp/input.c:807
  __rhashtable_lookup include/linux/rhashtable.h:633 [inline]
  rhltable_lookup include/linux/rhashtable.h:716 [inline]
  sctp_hash_transport+0x179/0xb00 net/sctp/input.c:890
  sctp_assoc_add_peer+0x31d/0x450 net/sctp/associola.c:718
  sctp_sendmsg+0xd59/0x14d0 net/sctp/socket.c:1921
  inet_sendmsg+0x54/0x250 net/ipv4/af_inet.c:763
  sock_sendmsg_nosec net/socket.c:636 [inline]
  sock_sendmsg+0x51/0x70 net/socket.c:646
  SYSC_sendto+0x17f/0x1d0 net/socket.c:1727
  SyS_sendto+0x40/0x50 net/socket.c:1695
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f601f497c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39
RDX: 0000000000000001 RSI: 0000000020aaff09 RDI: 000000000000001a
RBP: 00000000000003a1 R08: 000000002030bfe4 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f37b8
R13: 00000000ffffffff R14: 00007f601f4986d4 R15: 0000000000000002
Code: 00 01 8d 50 01 89 93 34 06 00 00 5b 5d c3 66 0f 1f 84 00 00 00 00 00  
55 48 89 e5 41 55 41 54 53 49 89 fc 49 89 f5 e8 dc 6e ed fe <41> 0f b7 3c  
24 e8 92 e3 ff ff 48 85 c0 74 21 48 89 c3 e8 c5 6e
RIP: sctp_cmp_addr_exact+0x14/0x60 net/sctp/associola.c:911 RSP:  
ffffc90000da7b38
CR2: 0000000000000078
---[ end trace 436f7126566693ea ]---


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

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